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# frozen_string_literal: true
module Gitlab
module Graphql
module Pagination
module Keyset
# https://gitlab.com/gitlab-org/gitlab/-/issues/334973
# Use the generic keyset implementation if the given ActiveRecord scope supports it.
# Note: this module is temporary, at some point it will be merged with Keyset::Connection
module GenericKeysetPagination
extend ActiveSupport::Concern
# rubocop: disable Naming/PredicateName
# rubocop: disable CodeReuse/ActiveRecord
def has_next_page
return super unless Gitlab::Pagination::Keyset::Order.keyset_aware?(items)
strong_memoize(:generic_keyset_pagination_has_next_page) do
if before
# If `before` is specified, that points to a specific record,
# even if it's the last one. Since we're asking for `before`,
# then the specific record we're pointing to is in the
# next page
true
elsif first
case sliced_nodes
when Array
sliced_nodes.size > limit_value
else
# If we count the number of requested items plus one (`limit_value + 1`),
# then if we get `limit_value + 1` then we know there is a next page
sliced_nodes.limit(1).offset(limit_value).exists?
# replacing relation count
# relation_count(set_limit(sliced_nodes, limit_value + 1)) == limit_value + 1
end
else
false
end
end
end
# rubocop: enable CodeReuse/ActiveRecord
def ordered_items
raise ArgumentError, 'Relation must have a primary key' unless items.primary_key.present?
return super unless Gitlab::Pagination::Keyset::Order.keyset_aware?(items)
items
end
def cursor_for(node)
return super unless Gitlab::Pagination::Keyset::Order.keyset_aware?(items)
order = Gitlab::Pagination::Keyset::Order.extract_keyset_order_object(items)
encode(order.cursor_attributes_for_node(node).to_json)
end
def slice_nodes(sliced, encoded_cursor, before_or_after)
return super unless Gitlab::Pagination::Keyset::Order.keyset_aware?(sliced)
order = Gitlab::Pagination::Keyset::Order.extract_keyset_order_object(sliced)
order = order.reversed_order if before_or_after == :before
decoded_cursor = ordering_from_encoded_json(encoded_cursor)
order.apply_cursor_conditions(sliced, decoded_cursor)
end
def sliced_nodes
return super unless Gitlab::Pagination::Keyset::Order.keyset_aware?(items)
sliced = ordered_items
sliced = slice_nodes(sliced, before, :before) if before.present?
sliced = slice_nodes(sliced, after, :after) if after.present?
sliced
end
def items
original_items = super
return original_items if Feature.disabled?(:new_graphql_keyset_pagination, default_enabled: :yaml) || Gitlab::Pagination::Keyset::Order.keyset_aware?(original_items)
strong_memoize(:generic_keyset_pagination_items) do
rebuilt_items_with_keyset_order, success = Gitlab::Pagination::Keyset::SimpleOrderBuilder.build(original_items)
success ? rebuilt_items_with_keyset_order : original_items
end
end
end
end
end
end
end
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